Coolio!!
Test Server
I had to give up on the RSS Feed idea....AJAX does not work across servers...at least not easily. This code just uses a local XML file(that I placed in our skin folder) for the notices, and can be changed on the fly without restarting Zimbra. I'd just have to write a script to push updates to all servers at once so we only had to change it in one place.
The data in the XML file is just HTML formatted...so it can look anyway you want practically.
This is the code I used....
Dynamic Drive DHTML Scripts- Ajax XML Ticker (txt file source)
If anyone wants the details let me know, but basically I added the required info into the login.jsp file to present the ticker on the login page, and put the ajaxticker.js and tickercontent.txt files in our skin folder.
Matt